Lottery officials have raised the Mega Millions grand prize to $660 million, giving players a shot at the nation’s ninth largest jackpot.

The prize for Friday night’s drawing has grown so large because there hasn’t been a winner in three months, allowing the jackpot to gradually grow from its $20 million starting point in April.

Even as the big prize has increased, the odds of winning the jackpot have remained at one in 302.5 million. The highlighted pre-tax $660 million prize is for a winner who takes an annuity option, paid out in 30 annual payments. Most players choose the cash option, which would be $376.9 million before taxes.